FreeRDP/server/shadow/shadow_rdpsnd.c

/**
 * FreeRDP: A Remote Desktop Protocol Implementation
 *
 * Copyright 2015 Jiang Zihao <zihao.jiang@yahoo.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <winpr/crt.h>
#include <freerdp/log.h>
#include <freerdp/codec/dsp.h>

#include "shadow.h"

#include "shadow_rdpsnd.h"

#define TAG SERVER_TAG("shadow")

/* Default supported audio formats */
static const AUDIO_FORMAT default_supported_audio_formats[] =
{
	{ WAVE_FORMAT_AAC_MS, 2, 44100, 176400, 4, 16, 0, NULL },
	{ WAVE_FORMAT_MPEGLAYER3, 2, 44100, 176400, 4, 16, 0, NULL },
	{ WAVE_FORMAT_GSM610, 2, 44100, 176400, 4, 16, 0, NULL },
	{ WAVE_FORMAT_PCM, 2, 44100, 176400, 4, 16, 0, NULL },
	{ WAVE_FORMAT_ALAW, 2, 22050, 44100, 2, 8, 0, NULL },
};
static AUDIO_FORMAT supported_audio_formats[ARRAYSIZE(default_supported_audio_formats)] = { 0 };

static void rdpsnd_activated(RdpsndServerContext* context)
{
	AUDIO_FORMAT* agreed_format = NULL;
	UINT16 i = 0, j = 0;

	for (i = 0; i < context->num_client_formats; i++)
	{
		for (j = 0; j < context->num_server_formats; j++)
		{
			if ((context->client_formats[i].wFormatTag == context->server_formats[j].wFormatTag) &&
			    (context->client_formats[i].nChannels == context->server_formats[j].nChannels) &&
			    (context->client_formats[i].nSamplesPerSec == context->server_formats[j].nSamplesPerSec))
			{
				agreed_format = (AUDIO_FORMAT*) &context->server_formats[j];
				break;
			}
		}

		if (agreed_format != NULL)
			break;
	}

	if (agreed_format == NULL)
	{
		WLog_ERR(TAG, "Could not agree on a audio format with the server\n");
		return;
	}

	context->SelectFormat(context, i);
}

int shadow_client_rdpsnd_init(rdpShadowClient* client)
{
	RdpsndServerContext* rdpsnd;
	rdpsnd = client->rdpsnd = rdpsnd_server_context_new(client->vcm);

	if (!rdpsnd)
	{
		return 0;
	}

	rdpsnd->data = client;

	if (client->subsystem->rdpsndFormats)
	{
		rdpsnd->server_formats = client->subsystem->rdpsndFormats;
		rdpsnd->num_server_formats = client->subsystem->nRdpsndFormats;
	}
	else
	{
		size_t x, y = 0;

		for (x = 0; x < ARRAYSIZE(default_supported_audio_formats); x++)
		{
			const AUDIO_FORMAT* format = &default_supported_audio_formats[x];

			if (freerdp_dsp_supports_format(format, TRUE))
				supported_audio_formats[y++] = *format;
		}

		/* Set default audio formats. */
		rdpsnd->server_formats = supported_audio_formats;
		rdpsnd->num_server_formats = y;
	}

	rdpsnd->src_format = rdpsnd->server_formats[0];
	rdpsnd->Activated = rdpsnd_activated;
	rdpsnd->Initialize(rdpsnd, TRUE);
	return 1;
}

void shadow_client_rdpsnd_uninit(rdpShadowClient* client)
{
	if (client->rdpsnd)
	{
		client->rdpsnd->Stop(client->rdpsnd);
		rdpsnd_server_context_free(client->rdpsnd);
		client->rdpsnd = NULL;
	}
}